METHOD AND GROUT INJECTION PIPE FOR MEASURING INJECTION CONDITION OF GROUT AND GROUT INJECTION CONTROL SYSTEM

摘要

PURPOSE:To estimate the distribution condition of grout injected by a method in which a gamma-rays source is inserted into a test pit, a gamma-rays detector is inserted into the other test pit, and the density of the grout before and after the injection of grout is measured to detect the difference in the densities. CONSTITUTION:The density of the ground before the injection of grout is measured, an injection pump 14 is actuated, and grout is injected into an injection pit 1 through an injection tube 12 inserted with a gamma-rays source 2. The counting rates of each gamma-rays detector inserted into each test pit 4 are recorded for every time interval during the period when the injection of a given amount of grout is ended, and finally the density after ending the injection is measured. On the basis of the distribution condition of density difference values of the ground before and after the injection of grout, the condition of grout injected into the ground can be estimated.