| 摘要 |
PURPOSE:To permit the concentration of a grout of be injected into the ground to measure continuously at any time by providing a concentration measurer consisting of a radiation source to irradiate a radiation to the grout, a rediation detector, and an arithmetical unit to calculate the concentration of the grout from the detected values. CONSTITUTION:A concentration measurer 9 for a grout consists of a pipe 1 to make up the pathway of the grout, a radiation source 3 to irradiate radiation to the grout being injected, a radiation detector 4, and an arithmetical unit 7 to calculate the concentration of the grout from the detected values of the detector 4. Liquid A in a liquid-A tank 13 and liquid B in a liquid-B are mixed in a mixing tank 15 and then injected into the ground through the concentration measurer 9, a flow meter 17, and an injection pipe 19 by an injection pump 16. In this case, the opening degrees of valves 21 and 22 are regulated in such a way that the detected values of the measurer 9 become a predetermined value. Also, data such as the concentration, amount, and pressure of the grout injected are recorded by a recorder 12 as time passes. |
