Concrete mortar string bucket

Hazards to concrete segregation: A string cylinder refers to a cylindrical object set up to prevent the concrete from segregating during the process of vertical conveying of concrete, and the concrete slides down through it. The function of the string cylinder is the same as that of the duct and the chute, and it is set up for conveying concrete. Generally, on the construction site, the stringer is directly connected to the conveying pipe of the pump truck. Segregation will occur when the free fall height of concrete exceeds 2 meters, so the concrete pouring for pile foundations exceeding 2 meters must be transported by conduits, strings or chutes. In the construction process of some projects, there are strict requirements for the upper and lower diameters of the serial cylinders. The main points of the manual digging pile installation string: There are two types of pouring concrete. When there is no water in the hole, the string is used to pour the ordinary concrete in the air environment. When the free fall height exceeds 3m, the string is used, and the bottom of the string is away from the hole. The bottom and the concrete surface should not exceed 2m. When the depth of the hole exceeds 12m, the conduit should be used for pouring. According to the pouring of underwater concrete, the distance between the conduit and the bottom of the hole should not exceed 1.5-2.0m, and the conduit should be removed in time during the pouring process. When the groundwater level infiltrated into the hole has a relatively large rising speed (generally more than 6mm/min), it should be regarded as a water pile and shall be poured in accordance with underwater concrete. First into the pile hole, at least to the same height as the stable water level outside the hole.