Sewer Trenchless Pipeline Construction Rehabilitation No Digging Underground Sewages

Trenchless rehab construction for no-digging repair underground sewages

Liner pulls in

1) Before pulling in the hose, it is advisable to set up a roller or fixed pulley at the wellhead and pipe orifice where the traction direction is changed. The roller or fixed pulley should be positioned and fixed with a lead screw. In the process of pulling in the hose, the place that may be in direct contact with other objects should be padded with protective film.

2) The connection between the hose and the winch traction wire rope shall meet the following requirements:

The hoist shall be placed in the opposite well of the hose blanking opening. The hoist shall be reliably specified, and the power-on test shall be normal;

The universal hook shall be selected for the hook between the front end of the hoist wire rope and the material connecting part to ensure that the hose can smoothly enter the pipe during the traction of the hoist;

Pull the steel wire rope through the pipe and connect with the hose through the pull rope inserted during the bottom membrane insertion.

3) Pretreatment of the hose before blanking

First, fold the two sides of the hose material with the end length of about 0.5m inward by 1/3, then fold it longitudinally, and place a lifting belt at the bottom of the folding line (the lifting belt is connected with the winch hook);

The folded part shall be fastened with 2 straps, and the outside shall be wrapped with a bottom film for protection,

4) Pull the hose. The hose pulled into the old pipe shall meet the following requirements:

Start the hoist, the pulling speed shall be controlled within 5m/min, the inching operation can be carried out according to the feeding condition of the hose, and the contact between the hose end and the hoist operator shall be maintained. It is recommended to use the interphone for real-time call control;

In the process of pulling in the hose, the operators at the end of the hose shall ensure that the bottom film does not move, and check the laying of the hose to see if it moves smoothly on the bottom film;

When the length of the hose outside the well mouth is close to the depth of the well, the winch shall be stopped, the tail of the hose shall be fastened with the thick rope with a tie, and the thick rope shall be tightened in the direction, and the winch shall be started again until the tail of the hose exceeds the pipe mouth by about 0.5m.