Follow the average stress principle of pipe jacking machine should be designed in the process, let each pass and roller can mean stress, so wear will be very balanced, extend its life, secondly, pay attention to the rolling stability problem of pipe jacking machine.
In the design and production, pay attention to the symmetry of the roller processing, and in advance to calculate the change to the neutral layer and the amount of materials used.
Once again, bending deformation may be problems, in the production process, this phenomenon is mainly due to uneven, the best solution is in the design of force balanced, accurate processing. Finally, in production, pay attention to the accuracy of roller processing and track arc processing and protection.
The prerequisite for the support of a pipe jacking machine, as a prerequisite for minimizing the friction resistance, is the prerequisite for the optimum supporting of the pipe jacking machine:
1., in the design process and in the push top process to accurately identify the soil layer, and according to the screening curve to grasp the soil particle distribution;
2., the excavated pressure is calculated to determine the pressing pressure of the bentonite suspension;
3. determine the mixing ratio of bentonite suspensions according to the basic particle size and test them frequently;
4. correctly prepare the pipe jacking machine and bentonite suspension bottle
6. ensure that all the jacking pipe, top pipe inlet and all jacking times have hydraulic suspension of bentonite.
The main structure of the hydraulic pipe jacking unit consists of four parts. The main part is mainly composed of two double acting hydraulic cylinders. Hydraulic pump station: equipped with diesel pumping station and motor pump station. Support plate: the action is to fix the machine and support the wall of the pit. Top and pull head: the action is to push in and pull back and enlarge the hole. This series of products mainly include: 60T/3, 80T/3, 100T/3, 120T/3, 850mm is less than or equal to the diameter of the hole diameter, the distance is less than 120 meters of construction. The machine is easy to operate, long service life and convenient maintenance. It is a necessary tool for medium and small trenchless engineering construction units.
