How long is the reinforcement cage for the ten-meter-long pile of hand-dug cast-in-place pile in the new specification?

The length of reinforcing cage is effective pile length+welding length+anchoring length. Large diameter, small diameter, with boundary, ≧800mm is a large diameter pile, because it involves the percentage of structural reinforcement arranged according to the section.

Long piles and short piles are not defined in the code, but only in books and documents. They are based on the ratio of pile length to pile diameter, because sometimes the slenderness ratio is considered, not the quantity. There is no fixed value, and some people think that the slenderness ratio ≧20 is a long pile.

At present, in order to improve work efficiency, the welding of reinforcing cage is usually changed to sleeve connection. In this case, there is no need to consider the welding length.

Key points of production control. Whether the raw materials of steel bars have been inspected, whether the specifications of raw materials meet the design requirements of drawings, stirrup spacing and lap length of welding points, covered electrode shall have a quality certificate. The reinforcing cage is made in strict accordance with the design, and the position of the main reinforcement is controlled by the reinforcement positioning bracket. Thickness of protective layer of reinforcement. Whether the butt joint of steel bar is bent as required, and whether the thickness and length of the weld at the bent part meet the quality requirements.