The distribution and sales of pre pressure water bags for pressure test of cast-in-place box girders, the rental and sale of static load water bags, the rental and sale of ballast lifting water bags, the distribution and sales of water bags, and the direct supply of manufacturers.

Through three-dimensional plastic design, the structure of the quick safety preloading test water bag is more reasonable and the concentrated stress is eliminated. Through numerical simulation and calculation, the material selection is more reasonable and the safety performance is ensured; The multi-layer composite structure makes the bag soft and well sealed. The bag is divided into three parts: the bag body, the transition section and the end. After setting out and cutting, it is spliced into a sealed bag. In order to increase the strength, the external composite reinforcement is added.