Concrete pouring conduit is used for underwater pouring of bored piles in large bridge engineering, railway engineering, highway engineering, hydropower engineering and high-rise foundation.
It is generally convenient for construction personnel to construct. The length of the conduit is generally 2m, 2.5m, 2.7m and 3m, and the bottom tube is generally 4m.
Equipped with adjustment sections of 0.5m, 1m and1.5m. ..
Plant container:
The conduit is a tubular structure, which mainly transports water and inorganic salts in the xylem of plants. It consists of a series of highly specialized tubular dead cells, the end walls of which are interconnected by perforations, and each cell is called a duct molecule or duct segment. Vessel molecules are living cells in the early stage of development. After maturity, protoplasm disintegrates and cells die.
In the process of maturation, the cell wall is lignified and has different forms of secondary thickening, such as rings, lines, ladders, nets and holes. On the end wall between two adjacent duct molecules, a perforated plate is formed after dissolution. In angiosperms, except for a few families and genera (such as Quinlan and Shuiqingshu), there are vessels; Catheters also exist in some ferns (such as Selaginella and Pteris europaea) and gymnosperms.
The catheter consists of a dead cell with only a cell wall, and the upper and lower cells are connected. It is located in the xylem of vascular bundle, and its function is very simple, that is, it transports water and inorganic salts absorbed from roots to all parts of the plant without energy.
The more evolved tree species are generally pit vessels and reticular vessels; Primitive tree species are generally annular threaded conduits; A catheter with a long molecule has a small diameter, and a catheter with a short molecule has a large diameter. The length of fiber molecules is generally larger than that of catheter molecules, and the caliber of fiber molecules is generally smaller than that of catheter molecules.