Support pressure test is an indispensable procedure in the process of bridge construction. How to reduce the cost is also a question that every project manager thinks about? Safe, fast and low cost are the basic principles of choice. Water bags are undoubtedly the best choice. But how can the purchase and lease of water bags be worthwhile? We will analyze the product structure characteristics, cost, construction requirements, purchase and lease for reference.

(1) structural characteristics

Pressure test water bags are divided into rubber water bags and PVC water bags; The rubber sealed water bag is made of rubber and cloth through layered bonding and vulcanization. It is generally about 3mm and weighs about 3kg per square meter. The capacity of a single water bag can only be 30-50t. The advantage is safe and fast. The disadvantage is that it is heavy and difficult to operate. Due to process reasons, the height of water level can only be less than 1.5m, which cannot meet the pressure test load requirements; PVC welded sealed water bag is a sealed water bag made of PVC structural film through cutting and welding. The material thickness is 0.6-0.9 mm. Its advantages are light weight, large capacity and low cost. Its disadvantages are easy to be scratched and worn. The highest safe water level is about 1.8 meters.

(2) cost

The normal cost of rubber water bag is about 200 yuan / ton, and the normal cost of PVC water bag is about 50-80 yuan / ton.

(3) construction requirements

The bottom plate is required to be smooth and flat to avoid scratches caused by sharp objects. For PVC water bags, heavy pressure and friction shall be avoided as much as possible.

(4) purchase water bags

The purchase of water bags is a one-time investment, and it takes time for the manufacturer to repair after problems occur. It is not realistic to add more water bags for projects that need to speed up progress. However, the water bag asset is its own and can be reused.

(5) renting water bags

The leased water bags of Wuhan Suan are provided with one-stop service, including leasing and construction. The number of water bags can be increased or decreased according to the construction progress and there is no worry of maintenance.