PROBLEMS OF PILE BORED ON THE SITE

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  • 場所打ちぐいの問題点
  • Immunochemical and biochemical studies of fungi-13-On the galactomannans isolated from mycelia and culture filtrates of several filamentous fungi

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In Japan, three methods as shown below are ususlly adopted as boring technique for piles ; a) the earth drilling method, b) the Benoto method, and c) the reverse circulation merhod. Though these three methods, whose way of excavation and way of protection concrete collapse of surface of excavated well, differ each other, have their own peculiar problems, they have also some problems common to the all three. Among them, there exist the risks as follow ; 1) decline of bearing capacity of pile which may cause in case of lack of care for exclusion of slime deposited at the bottom of the well, 2) collapse of bored well due to the influx of underground water, 3) decline of concrete strength due to the admixture with muddy water which may cause in case of casting in the muddy pool. This report relates principally to the causes and the preventive measures of these problems.

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