| 摘要 |
PROBLEM TO BE SOLVED: To stabilize mixing control in a short time while allowing mixing at an optional mixing ratio and to prevent mixing control from becoming unstable even when changing a flow ratio in the middle of injection in a ground injection method for mixing a plurality of kinds of injection liquid to inject a mixed liquid into the ground through an injection pipe. SOLUTION: In the ground injection method for mixing an A-liquid (a first injection liquid) and a B-liquid (a second injection liquid) to inject a mixed injection liquid into the ground through the injection pipe, the larger one in the flow ratio out of the A-liquid and B-liquid is made a main liquid, and the smaller one is made a sub-liquid. After starting injection, the flow of the main liquid is increased, and when the flow input value (the measured value) of the main liquid reaches a reference value, the flow of the sub-liquid is increased. When a pressure input value (a measured value) reaches a reference value, and the flow input value (the measured value) of the sub-liquid reaches a reference value, the flow set value of the main liquid is computed based on the flow set value of the mixed liquid determined in specification and the mixing rate of each injection liquid, and flow control of the main liquid is performed based on the computed flow set value of the main liquid. The flow set value of the sub-liquid is computed based on the measured value of flow of the main liquid and the mixing ratio of the sub-liquid, and flow control of the sub-liquid is performed based on the computed flow set value of the sub-liquid. COPYRIGHT: (C)2006,JPO&NCIPI
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