The company has four suggestions on how to deal with the deviation of pneumatic butterfly valve:
1. The concrete cutting speed should be slow, the cutting should be as uniform as possible, and the outlet height should be as low as possible to reduce the impact reaction. Low frequency vibrating rod shall be selected, and the vibrating time shall not be too long. The end of the vibrating rod shall not contact the core mold to prevent air leakage penetration. Adding a small amount of bubbles into ordinary concrete can achieve the purpose of initial slurry soaking.
1. It also controls the workability of concrete. Even blanking and synchronous vibration.
2. Control the volume of the rubber ball. Before pouring concrete, the rubber core mold must be inflated according to the inflation pressure in the manufacturer's instructions. In other practical operations, measure the inflation deformation value of the pneumatic butterfly valve itself to prevent it from being higher than the planned starting pressure when it is charged to the planned starting pressure. This will invisibly expand the volume of beam and plate cavity, resulting in insufficient thickness of side plate and roof. Therefore, the air pressure should be inflated according to the regulations, and adjusted according to the aging situation and on-site measurement control, generally 5 cm smaller than the planned diameter.
3. If the slump of concrete can be well controlled, as long as the requirements of construction operation and specifications are met, the slump of concrete will be small.
4. Floating and offset of the pneumatic butterfly valve of the afterburner: generally, the positioning rebar is used to fix the internal mold of the pneumatic butterfly valve. First, the circular anti floating reinforcement shall be pre bound according to the planned hollow direction and specification when binding the reinforcement. What is anti floating reinforcement? 8-10 mm, distance 50 cm. If necessary. Lower the anti floating reinforcement to a certain height, and add balloon internal formwork around the balloon to fix the positioning reinforcement. The diameter of positioning rebar is 10 and the spacing is 50cm. Secondly, in the process of concrete pouring, five strip steel plates are evenly padded on the roof of the pneumatic butterfly valve. This method not only solves the problem of thickness and uniformity of web, but also improves the thickness and uniformity of roof.