Construction technical process of PE pipe jacking high voltage cable protection pipe,Today, we HDPE pipe manufacturers will share with you.
1, head choice: according to the geological declaration and combined with the construction history, PE pipe jacking and promotion machine decision to apply pressure equilibrium net head (water flushing) construction. During the promotion process, the head is equalized with the air pressure to equalize the lateral pressure of the ground and reduce the influence of the internal soil on the surrounding soil.
2, lifting equipment and landing process
(1) Critical upper part: the critical top adopts 4 sets of 200 tons/set of jacks, and the jack travel is 1.4 meters. The jack is powered by an oil pump. The back end of the jack applies the wood and partial pressure of the way to apply the reaction force evenly to the pit, and the front end advances towards the partial pressure ring, and the upper plate communicates the upper force to the pipe binding. The partial pressure ring has sufficient stiffness so that it is flat and does not deform when it encounters the end face of the tube.
(2) Trunk room: in the process of slow interval take-off and landing, when the take-off and landing resistance spans the allowable total lift force, and when the lift interval cannot be reached at one time, the equipment relay must be set between the relays. When the length of the cat spans 100 meters, a relay chamber is set up in front of the head of the machine and thixotropic slurry process is adopted.
The relay chamber consists of a front cover, a jack and a back cover. The front shell is connected before the connection, the back shell is connected after the connection, the shell is connected through the process socket, and the rubber seal water seal is used to prevent water and soil outside the pipe from flowing into the pipe.
In each relay chamber, 10 shots of Z force of 30 tons are installed, and the shots are arranged evenly along the circle. The cat has a travel of 28 cm and is secured to the front shell by fasteners made of flat iron. The layout of the steel shell is finished to ensure that it does not deform during application. The outer diameter of the relay shell is similar to the outer diameter of the tube, which can reduce soil disturbance, soil settlement and thousand pieces of roof resistance. After lifting the pipe, remove the various accessories of the jack, and fill the space between the shell and the inner wall of the pipe with fine stone concrete.
3. Interface: The interface of PE pipe jacking is mainly composed of rubber ring and soft texture pad of sleeve ring (steel ring). The steel collar will not be deformed during the processing process from the field transport and promotion process, and the interface will not be damaged to ensure that the rubber belt will not shift or reverse during the connection process to ensure the sealing pipe. At the same time, the steel ring sleeve must stop pretreatment before entering the site.