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对于管外壁摩阻力,在很大程度上可以通过各种手段来施加影响。首先要注意管子表面的光洁平滑,以保持很低的摩擦系数。此外极为重要的是,管子要尽可能避免圆度误差,并保持直径的一致。在这方面,如果管子是用许多管模制造的,问题可能就出现在制管厂中,因为管模本来就有尺寸公差,而且磨损程度也不相同。此外,如果管子浇注之后脱模过早,或者由于蒸养而发生收缩,也会引起这类的偏差。管子尺寸的不准确在推顶时会导致产生夹紧力,这种力有时可能达到很高的数值。
For the friction resistance of the outer wall, to a large extent by a variety of means to exert influence. First of all pay attention to smooth and smooth tube surface to maintain a low coefficient of friction. In addition, it is extremely important that the tube avoid circularity errors as much as possible and maintain the same diameter. In this respect, if the pipe is made from many pipe molds, the problem may arise in the pipe mill because the pipe die is inherently dimensionally dimensioned and not to the same degree of wear. In addition, such variations can be caused if the molds are prematurely cast after the tube is cast, or if shrinkage occurs due to steaming. Inaccuracies in pipe dimensions cause a clamping force when pushed up, which can sometimes reach very high values.