Bridge Pre-tensioning Water Bag

Pre-compression water bags are currently mainly used in the construction of railway and highway bridges. During the bridge construction phase, pre-compression testing of the bridge load is a crucial quality control task to ensure the project meets quality standards.

Traditionally, actual pressure tests on bridges are conducted by stacking iron cans or sandbags. It requires substantial labor and resources to transport these heavy, bulky items from the ground to the bridge, especially in poor construction environments. This process is time-consuming and labor-intensive, necessitating the use of heavy lifting and transportation equipment, and poses certain safety risks to workers. However, by using collapsible water bags for preloading, these issues are easily resolved.

The bridge pre-tensioning water bags are made from double-layered sandwiched PVC material, heat-sealed at high temperatures, offering resistance to low temperatures and UV rays, with a long service life. They are easy to transport and operate when empty, requiring only that the operator place the empty bag at the pre-tensioning location and then fill it with water using a pump for testing. Due to their simplicity, accuracy, low cost, and reusability, these water bags will be the ideal choice for bridge pre-tensioning in the future.

Bridge pre-tensioning water bag usage instructions:

A. Place the bridge pre-stressing water bag flat and spread out in the pre-stressing position. The water outlet valve is located at the lower end of the bag, with the valve pointing downwards, exposing the bottom mold, and then close the switch.

B. Utilize a high-pressure water pump, attach the water pipe to the inlet valve, turn on the switch and the exhaust switch, and expel the air inside the bag. Begin filling with water, and once the bridge's pre-pressure water bag is full, close the valve.

C. Once the template stops sinking within the required pre-pressure time (3-7 days), open the lower water valve and release the water.

D. Prevent nails or sharp objects from piercing the bridge's pre-compression water bags during construction. In case of a tear, roughen the edges with an angle grinder or wood file, apply a layer of water-soluble glue, and cover with waterproof tape. Use the manufacturer's recommended glue for repair, and let it sit for the suggested duration before use.

After use, fold the bridge pre-stress water bag and store it indoors to avoid direct sunlight.